Malicious PDF — malware analysis report

Static analysis result for SHA-256 177664b4d22737bd…

MALICIOUS

PDF

56.9 KB Created: 2020-09-30 22:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0fbf279ae5db47757e2285503aeb6f3b SHA-1: a806b942ef1d2711edf99eb3494088500221caa7 SHA-256: 177664b4d22737bd07b377ba3d4d84b2fa5a65b248ce2edd3d2351f6c66de0ea
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=becoming+a+better+listener+pdf In PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/sajaf.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/kisusinefulajit.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/82210400053.pdfIn PDF document text
    • http://files.signshares.com/uploads/1/3/2/7/132712530/wokedugemofen_remivirijozas_purilazevexaxon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fd945a-3949-4fa1-a2d0-f9712b0d3ec9/52125949285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7dfb77-10ff-4261-b483-874fb005eda3/40757798033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d38d89-c0b5-4c2b-8729-e9c7a7714d5f/93721778392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/bloom_s_taxonomy_question_stems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7301/9560/files/dakigebufukekuxirowekog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA05B 5664 bytes
SHA-256: 34b435858b5b37a0faa275ee16be4573ed745e9974b9183eb7b6e09b3e558e94
font_01_sfnt_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 10548 bytes
SHA-256: 902be44e4415dfbbedbbde4e24d3e7f284b133edd260ac10158750ef4ae791fe